円形鋼管トラス柱の曲げねじれ座屈に関する実験的研究
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概要
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It is well known that rigidly-jointed truss beam-columns which are fabricated from circular tubes by welding have the high strength of lateral-torsional buckling. This is because the high torsional rigidity of tubular chords is effectively utilized against the lateral-torsional buckling, provided that the chords are well restraint by web members. However, the AIJ design standard uses the safest approximation and neglects the advantage of tubes or the restraining effect by web members, which obviously leads to uneconomical design. On the other hand, the web members may cause local deformations in the chords arround the connections, which reduce the buckling strength. Therefore, the rational design requires the accurate evaluation of the buckling strength, taking both advantageous and disadvantageous effects mentioned above into consideration. From this point of view, an experimental work and the theoretical analysis which includes the effect of the local deformation are carried out. The paper presents the experimental and theoretical results and discusses the restraining effect by web members and the influence of joint rigidity reduced by local deformations.
- 1986-05-30
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